Look at the difference in Salmonella rates between the US and France for instance.

And yes, regulatory capture is an issue with the FDA, that has periodically resulted in scandals; but the meatpacking industry knows that without some obvious checks on their hygiene their industry as a whole is worse off. If one plant cuts too many corners and starts shipping moldy meat, the entire industries sales suffer; so it's in the meat companies interest to have someone policing defectors from good practices.